<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      @click-left="$router.back()"
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div
        v-if="loading"
        class="loading-wrap"
      >
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div
        v-else-if="article.title"
        class="article-detail"
      >
        <!-- 文章标题 -->
        <h1 class="article-title">{{article.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell
          class="user-info"
          center
          :border="false"
        >
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo
"
          />
          <div
            slot="title"
            class="user-name"
          >{{article.aut_name}}
          </div>
          <div
            slot="label"
            class="publish-date"
          >{{article.pubdate|relativeTime
}}</div>
          <van-button
            v-if="article.is_followed"
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            :loading='followLoading'
            size="small"
            icon="plus"
            @click="followFn"
          >关注</van-button>
          <van-button
            v-else
            class="follow-btn"
            round
            :loading='followLoading'
            size="small"
            @click="followFn"
          >已关注</van-button>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          ref="article-content"
          class="article-content markdown-body"
          v-html="article.content
"
        ></div>
        <van-divider>正文结束</van-divider>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div
        v-else-if="errStatus===404"
        class="error-wrap"
      >
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div
        v-else
        class="error-wrap"
      >
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
      >写评论
      </van-button>
      <van-icon
        class="comment-icon"
        name="comment-o"
        info="123"
      />
      <van-button
        class="btn-item"
        icon="star-o"
      />
      <van-button
        class="btn-item"
        icon="good-job-o"
      />
      <van-icon
        name="share"
        color="#777777"
      ></van-icon>
    </div>
    <!-- /底部区域 -->
  </div>
</template>

<script>
import { ImagePreview } from 'vant'
import './github-markdown.css'
import { getArticleInfo } from '@/api/article'
import { addFollow, removeFollow } from '@/api/user'
export default {
  name: 'ArticleItem',
  components: {},
  props: {
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  data () {
    return {
      article: {},
      loading: false, // 加载中的 loading 状态
      errStatus: 0, // 失败的状态码
      followLoading: false
    }
  },
  // 计算属性
  computed: {},
  // 侦听器
  watch: {},
  created () {
    this.getArticleInfoFn()
  },
  mounted () {
  },
  updated () {
    this.previewImage()
  },
  methods: {
    async followFn () {
      this.followLoading = true
      if (this.article.is_followed) {
        await removeFollow(this.article.aut_id)
      } else {
        await addFollow(this.article.aut_id)
      }
      this.article.is_followed = !this.article.is_followed
      this.followLoading = false
    },
    async getArticleInfoFn () {
      this.loading = true
      try {
        const { data } = await getArticleInfo(this.articleId)
        this.article = data.data
        // this.$nextTick(() => {
        //   this.previewImage()
        // })
        // setTimeout(() => {
        //   this.$nextTick(() => {
        //     this.previewImage()
        //   })
        // }, 0)
        setTimeout(() => {
          this.previewImage()
        }, 0)
      } catch (error) {
        if (error.response && error.response.status === 404) {
          this.errStatus = 404
        }
      }
      this.loading = false
    },
    previewImage () {
      const dom = this.$refs['article-content']
      console.log(dom)
      const imgs = dom.querySelectorAll('img')
      console.log(imgs)
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: #fff;
  }
  .article-detail {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 40px;
    }
    .comment-icon {
      top: 2px;
      color: #777;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
    .btn-item {
      border: none;
      padding: 0;
      height: 40px;
      line-height: 40px;
      color: #777777;
    }
    .collect-btn--collected {
      color: #ffa500;
    }
    .like-btn--liked {
      color: #e5645f;
    }
  }
}
</style>
